I used command line option to start IDEA with specified project. For example:
This allowed me to start two (or more) IDEA instances with different projects. Unfortunately this technique is not working anymore. I changed my projects to .idea style and upgraded to v9.0.3.
Steps to reproduce:
1. Execute command <IDEA-HOME>\bin\idea.exe c:\projects\ABC
The IDEA opens project ABC.
2. Execute command <IDEA-HOME>\bin\idea.exe c:\projects\XYZ
New IDEA instance with XYZ project is created (ABC project is still available in another frame)
Focus is passed to IDEA with ABC project, the project XYZ is not open.
How to open two or more instances of IDEA with different projects?